I am Pulling some parts from a non running NAA to a still using 6 volt Jubilee. The NAA is definitely converted to 12 volt but the generator has three wires going from it and looks like the original, cast iron front. There are no numbers on it. Did older generators 6 and 12 both look the same? OR did whoever made this conversion leave the old 6 volt in? How do I tell what voltage a generator is?

(quoted from post at 10:55:32 09/25/12) I am Pulling some parts from a non running NAA to a still using 6 volt Jubilee. The NAA is definitely converted to 12 volt but the generator has three wires going from it and looks like the original, cast iron front. There are no numbers on it. Did older generators 6 and 12 both look the same? OR did whoever made this conversion leave the old 6 volt in? How do I tell what voltage a generator is?

!2v generators of the next gen diesel tractors had a pulley fan & cooling slots at rear of barrel. Any 6 v can be modified into a 12v. Measure resistance of field coils with Ohmmeter connected from Field terminal to case ground & if about 2 to 4 Ohms, it is a 6v & if about twice that, then a 12v. I did say 'about'. Such a rule of thumb does not apply to 100 ampere fire truck/ambulance generators & the like.

Hello JMOR, You are very close all 6 Volt Generators(made 1953-1965) look as your photo and are sealed front and rear of case . Your 12 Volt Gen. photo is a Car or Truck Generator which ALL HAVE FOUR SLOTS in the rear of the case . Original Ford Diesel Tractor 12 Volt Gen.(made from 1958-1965 , no diesels in the hundred series) have ONLY ONE SLOT in the rear of the case pointing downward . The bands are generally on REMANUFACTURED UNITS(because car, truck, and tractors are the same case design except the cooling slots) from Ford or many of the Brand Name Rebuilders to keep the water out of them when installed in Tractors or other Ford Industrial applications . THANKS TONY

(quoted from post at 00:20:53 09/26/12) Hello JMOR, You are very close all 6 Volt Generators(made 1953-1965) look as your photo and are sealed front and rear of case . Your 12 Volt Gen. photo is a Car or Truck Generator which ALL HAVE FOUR SLOTS in the rear of the case . Original Ford Diesel Tractor 12 Volt Gen.(made from 1958-1965 , no diesels in the hundred series) have ONLY ONE SLOT in the rear of the case pointing downward . The bands are generally on REMANUFACTURED UNITS(because car, truck, and tractors are the same case design except the cooling slots) from Ford or many of the Brand Name Rebuilders to keep the water out of them when installed in Tractors or other Ford Industrial applications . THANKS TONY

Are number of slots same for 20amp (2900450) and 25amp (B9NF-10002-A)? Both 12v units listed in FO-20.

Hello JMOR , Yes all tractors had just the one slot to keep the water out and let the heat out . Many Industrial units used truck generators with the truck rubber boot on the back of them to keep water out . Thanks Tony

(quoted from post at 09:55:32 09/25/12) I am Pulling some parts from a non running NAA to a still using 6 volt Jubilee. The NAA is definitely converted to 12 volt but the generator has three wires going from it and looks like the original, cast iron front. There are no numbers on it. Did older generators 6 and 12 both look the same? OR did whoever made this conversion leave the old 6 volt in? How do I tell what voltage a generator is?

Here is a photo of a factory 6V from my '63 4000 gasoline tractor
You'll notice the only differences in appearance between it and the following factory 12V on my '64 4000 diesel is that it has a narrow band around its circumference near the back end and the diesel does not. The 12V diesel does have a cooling fan and one cooling slot on the bottom as Tony suggests. The 6V gasoline does not.

Fast Shipping! Most of our stocked parts ship within 24 hours (M-Th). Expedited shipping available, just call! Most prices for parts and manuals are below our competitors. Compare our super low shipping rates! We have the parts you need to repair your tractor. We are a company you can trust and have generous return policies. Shop Online Today or call our friendly sales staff toll free (800) 853-2651. [ About Us ]

All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy

TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.